package demo;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;

public class StreamApiDemo {
    public static void main(String[] args) {
        Random rand = new Random();
        List<Integer> list = new ArrayList<>();
        for (int i = 0;i<10;i++){
            list.add(rand.nextInt(10));
        }
        System.out.println(list);

        List<Integer> list2 = list.stream()
                .map(e1->e1*2)
                .collect(Collectors.toList());
        System.out.println(list2);//添加map的中间环节，将每个元素扩大2倍



        List<Integer> list3 = list.stream()
                .filter(e->e%2==0)
                .collect(Collectors.toList());
        System.out.println(list3);//筛选


        List<Integer> list4 = list.stream()
                .distinct()
                .collect(Collectors.toList());
        System.out.println(list4);//去重




        List<Integer> list5 = list.stream()
                .sorted((e1,e2)->e2-e1)
                .collect(Collectors.toList());//排序，倒叙



























    }





}
